Upper structures: complex chords are two easy shapes

The illusion of complexity

Put D♭13(♯11) in front of most players and they start counting: root, third, fifth, seventh, ninth, sharp eleventh, thirteenth. Seven notes, two of them altered. By the time the arithmetic is done the bar is gone.

Nobody who plays this music for a living is calculating. They are playing two simple chords at the same time — and the complicated name is just what those two chords add up to.

The division of labor never changes:

• Left hand — the shell. The least you can play and still name the chord: the root and the 7th.
• Right hand — the structure. A plain major or minor triad. Nothing else. The trick is which triad.

Written down, it is a fraction: E♭ majorD♭7 means "play an E♭ major triad over a D♭7 shell". Your right hand plays three notes it has known for years, and the chord symbol says 13♯11.

Start with the shell: root and 7th

The 3rd and the 5th feel essential. They are not, and dropping them is what makes room for everything else.

• The 5th says nothing. It is in the major chord, the minor chord and the dominant — it never distinguishes anything. Drop it first, always.
• The root and the 7th are the frame. Together they say "this is some kind of C seventh chord".
• The 3rd decides major or minor — but once the right hand plays a triad, the 3rd usually turns up in it anyway, so the left hand can leave it out.

So the left hand plays two notes and stops. This feels wrong for about a week, and then every voicing you learn afterwards has somewhere to live.

Drill it: the bare shell in every key — the app asks for root + ♭7 in the left hand and nothing else, and draws it on the keyboard. When that is automatic, add the right hand: left plays the root, right plays the chord without doubling it.

The triad you already know is already in there

Before the famous tricks, notice that the everyday chords are upper structures too — nobody sells them that way because they have boring names.

Stack the chord in thirds and look at the top three notes:

• Cmaj7 = C E G B. The top three are E G B — an E minor triad.
• Cmaj9 = C E G B D. There is a G major triad (G B D) sitting in it.
• Cm7 = C E♭ G B♭ → E♭ major (E♭ G B♭) over a C shell.
• C9 = C E G B♭ D → G minor (G B♭ D) over a C7 shell.

One rule covers all four: the triad built on the 3rd or on the 5th of the chord is already an upper structure. Play a minor triad a major third above the root and you have a maj7. Play a major triad a minor third above and you have a m7.

Open the info panel on the practice page (press I) and it will name the structure for whatever chord is on screen.

Two ways to make this automatic: walk a key in 7th chords — every degree, in order, so your hand learns where the sevenths live — and name them from the symbol, which needs no keyboard at all and works on a phone.

The three hacks worth memorizing

These are the ones that turn a terrifying symbol into a shape. All three put a major triad in the right hand over a dominant shell — only the distance changes.

1. A whole step UP → 13♯11

The floating, wide-open sound. Over a C7 shell, play a D major triad: D is the 9th, F♯ is the ♯11, A is the 13th. Three notes, three extensions, no arithmetic.

Drill this exact voicing in all twelve keys — both hands, graded as written.

2. A whole step DOWN → minor 11

The thick, soulful one, and a staple of R&B. Over a C minor shell, play a B♭ major triad: B♭ is the ♭7, D is the 9th, F is the 11th.

Drill the two-handed shape, or drill m11 chords and find the triad yourself.

3. A major 3rd DOWN → 7♯9♯5

The nastiest turnaround chord in the book. Over a C7 shell, play an A♭ major triad: A♭ is the ♯5, C is the root, E♭ is the ♯9.

Drill the altered shape until your hand finds it without looking.

Once the shape is in your hand you can improvise off it — the right hand is just a major triad, so any lick you know in that key works over the top, however frightening the chord symbol looks.

Learn the sound, not only the shape. Ear training plays the chord and asks you to name it: 13♯11 by ear · m11 by ear · 7♯9♯5 by ear. And when the shape is there but slow, let the app push the tempo up from 60 bpm, ten beats at a time.

Rootless voicings: let the bass have the root

In a band the bass player is already playing the root. Doubling it wastes your best fingers on the one note nobody needs from you. Drop it and the same hand can hold four colors instead.

The two classic left-hand shapes — learn both for every chord and you can comp through most standards:

• A form: 3 – 5 – 7 – 9 (for Cm9: E♭ G B♭ D)
• B form: 7 – 9 – 3 – 5 (the same notes, rotated so the 7th is on the bottom)

Alternate them as the harmony moves and your hand barely travels: ii–V–I with A on the ii lands on B for the V, then A again for the I.

Practicing alone with no bass player? Turn on Rootless chords in Preferences and the app stops asking for the root — you drill exactly what you would play on the gig. Minor 9ths, rootless · dominant 9ths, rootless · the A form itself, one hand, every key.

Playing solo, with nobody covering the bottom? Then the left hand owes a root after all — drill it as octaves for a stride feel, or as root + 5th for the open, country-ballad one, while the right hand keeps the colors.

More extension tricks

Quartal voicings — stack 4ths instead of 3rds

Thirds sound like a chord; fourths sound like a color. Three or four perfect 4ths stacked on any chord tone of a minor 11 give you the modern, open sound instantly. The famous one is the "So What" voicing: three 4ths with a major 3rd on top. Drill it in every key, and walk the dorian mode it lives in to hear why it never sounds wrong.

Drop 2 — unstick a close voicing

Take a close four-note chord and drop the second voice from the top an octave. Cmaj7 close is C E G B; drop the G and you get G C E B, which spreads across the hand and stops sounding like a textbook. Do the same to the third voice and you have drop 3.

Drops are a reading skill as much as a hand shape, so practice them off the stave: maj7 chords in notation instead of chord symbols.

6/9 — richness with no 7th at all

Not every rich chord needs a seventh. Replace it with the 6th and add the 9th: C E A D. It is the classic ending chord, warm and final where a maj7 still leans forward. Drill the 6/9 shape.

The tritone substitution

G7 and D♭7 share their two important notes — the 3rd and the ♭7 swap roles. So any dominant can be replaced by the dominant a tritone away, and every trick above still applies. Play the whole-step-up hack over D♭7 and you get D♭13♯11 resolving into C, a common sound at the end of ballads. Play the substitution in context.

The diminished trick

One diminished 7th chord is four rootless ♭9 dominants at once. B°7 over a G bass is G7♭9; the same shape over B♭, D♭ or E gives you three more. One shape, four chords — drill dim7 in every key and you have learned twelve dominants.

From lead sheet to record: one ii–V–I, four levels

Here is the whole guide in one progression. The lead sheet says Dm7 · G7 · Cmaj7 — three of the most ordinary chords in music. Play it four ways, and play each one in the app.

1. Level 1 — as written. Root position, all the notes. Correct, and it sounds like homework. Play the lead sheet.
2. Level 2 — shells. Left hand plays root + 7th and nothing else. Suddenly there is air. Drill the shell hand.
3. Level 3 — rootless. Left hand plays 3 5 7 9, no root. Now it sounds like a piano trio. Drill rootless.
4. Level 4 — upper structures. Shell in the left, triad in the right, one hack per chord. Play the enriched sheet — same three bars, different century.

Level 4, chord by chord — and notice you are only ever playing major and minor triads with your right hand:

• Dm7 → Dm11: whole step DOWN. C major triad over a D shell.
• G7 → G7♯9♯5: major 3rd DOWN. E♭ major triad over a G shell.
• Cmaj7 → Cmaj9: the triad on the 5th. G major triad over a C shell.

Four more ways to work the same three bars:

• Roots only — one note per chord, to get the shape of the progression under your hands before any color goes on top.
• Labeled by degree — the question shows ii, V, I instead of chord names, which is how you learn to transpose without thinking.
• Around the circle of fifths — play it twice, then the app moves a fifth and asks again. Twelve keys without touching a setting.
• Plain ii–V–I if you just want to play.

That is the whole method. When a chart says a plain m7, you have a choice; when it says something frightening, you have a shape.

Turning PianoKitty into your voicing practice room

Everything above maps onto a switch in the app. Set it once and the drill does the nagging for you.

Left plays → root

Under Hand = both in Preferences. The left hand is graded on the root alone while the right handles the chord — the shell habit, enforced. Try it on dominant 7ths.

Rootless chords

The app stops asking for the root, so a 3 5 7 9 voicing counts as correct. This is how you practice for a band. Try it on 9ths.

Ninja voicings

Tick the exact notes you want in each hand and the app drills that voicing through all twelve keys, grading what you actually play. This is the one to use for the three hacks. Shell + whole step up · shell + major 3rd down.

Progressions

Type Roman numerals and drill them in every key — ii V I, or anything else you are working on. ii–V–I · I vi ii V.

Songs

Paste a literal chord list — your own lead sheet, as written or enriched. A turnaround with all three hacks in it.

Ear training

The app plays the chord and you name it. Shapes you cannot hear are shapes you will never reach for. 13♯11 · m11.

Naming quiz

No keyboard needed — read the symbol, pick the chord. The one to use at a bus stop. The three hack chords.

Staff notation

Swap chord symbols for notation and the same drill becomes sight-reading. maj9 off the stave.

One-note mode

Whatever is drawn, only the root has to be played — the gentlest possible first pass through a new progression. ii–V–I, roots only.

Repeat each chord

Ask for the same chord several times before moving on; repetition is what turns a shape into a habit. 13♯11, three times each.

Progressive tempo

Start at a tempo you can actually play and let the app raise it as you get it right. m11 from 60 to 120 bpm.

Scales, harmonized

Walk a key as triads, 7ths or 9ths and the structures stop being isolated shapes. Major, in 7ths · melodic minor, in 7ths — the family both altered chords come from.

Chord info panel (I)

On the practice page it names the upper structure for whatever chord is on screen — the triad, the shell, and the degrees it lands on.

And when the shapes are the problem rather than the theory: plain major and minor triads, all twelve roots. Everything in this guide is built out of those.

How to practice this

Four routines, in the order that works:

1. The whole-step workout. Pick a bass note. Play its dominant shell in the left hand, drop a major triad a whole step above it in the right. Listen to that 13♯11. Move up a half step. Repeat through all twelve keys — it takes about four minutes, and it is the routine to start with. Set it up in one click.
2. The progression lap. Put a ii–V–I on and let the app walk it around the circle of fifths while you apply one hack per chord. This is the drill that turns the tricks into playing.
3. The triad scan. Take any chart. Everywhere you see an m11, pencil in "major triad a whole step down". Everywhere you see an altered dominant, pencil in "major triad a major 3rd down". You are training your eyes to see shapes instead of arithmetic.
4. Triads in every key, cold. All of this collapses if the right hand has to think about E♭ major. Drill the plain triads until they are free — then the fancy chords cost nothing. Major and minor, all twelve roots.